Snap Swabs have IPA solution sealed in the Polypropylene handle, simply snap the handle, the IPA solution will come out and fulfil the foam head. IPA Snap Foam Swab have longer storage life, easy to use. The tip is constructed by 100 PPI Polyurethane foam. The only disadvantage is that it is more difficult for shipping due to concentrated liquid sealed in the handle, resulting in might be arrested by custom for secure reason.